While trying to move forty kids six blocks in New York City all alone, a stressed man accidentally loses a bouquet of a hundred balloons. In that bouquet, a lone black balloon scurries free. It dies and comes back to life, returning to the city cruising for a companion. On the beat, it learns that humans are complicated creatures with extreme highs and lows, but full of life nonetheless. An intended for children's film turned sci-fi urban fable.